Process and apparatus for latexing cords



May 12, 1936. N. J. RITZERT PROCESS AND APPARATUS FOR LATEXING CORDSFiled Feb. 13, 1934 8 Sheets-Sheet l 11v VENTOR waz/v/i/v a. M7256 flK/BY A TTORNE Yo i 3 O R y 1935- N. J. RITZERT 2,040,105

PROCESS AND APPARATUS FOR LATEXLNG CORDS Filed Feb. 13, 1954 8Sheets-Sheet 2 INVENTOR WJRITZEZT W 2 A TTORNEYS my I May 12, 1936. N.J. RITZERT PROCESS AND APPARATUS FOR LATEXING CORD-'5 Filed Feb. 15,1934 8 Sheets-Sheet 4 IN VENTOR AWE/714A LE/77527 M A TTORNE Y6 May 12,1936. N. J. RITZERT 2,040,105.

PROCESS AND APPARATUS FOR LATEXING CORDS Filed Feb. 15, 1934 8Sheets-Sheet 6 WW w IN VENTOR NORMAN J. k/TZEET. 4' A A t Z May 12,1936. N. J. RITZERT 2,040,105

PROCESS AND APPARATUS FOR LATEXING CORDS Filed Feb. 15, 1934 8Sheets-Sheet 7 I9 I78 197 no 11v VENTOR AWE/141V u. 2/ 72672?- W ATTORNE Ys y 1936- N. J. RITZERT 2,040,105

PROCESS AND APPARATUS FOR LATEXING CORDS Filed Feb. 13, 1954 8Sheets-Sheet 8 Patented May 12, 1936 UNITED STATES PROCESS AND APPARATUSFOR LATEXING CORDS Norman J. Ritzert, Dayton, Ohio, assignor to TheDayton Rubber Mfg. Company, Dayton, Ohio, a corporation oi. OhioApplication February 13, 1934, Serial No. 711,033

7 Claims.

This invention relates to methods of and apparatus for impregnating andcoating cords with latex.

The problems encountered in making this in- 5 vention were to find aprocess and means of thoroughly and completely impregnating and coatingheavy cords with latex, such cords being used for the neutral axisportions of rubber belts; also to keep the latex from getting into theworking parts of the apparatus; also to maintain the pulling of the cordunder an even tension yet with the slightest convenient tension while itis passing through the latex; and also to shut off the machineautomatically in the event of a 1.; snarl or a tangle.

One object of my invention is to provide a method of completelyimpregnating a cord with latex throughout itsainterior fibers, as wellas to regulate the tension of the cord while impregnating it, and alsoto coat the cord after such impregnation.

Another object is to provide apparatus for impregnating and/or coatingthe cord with latex, whereby the interior fibers of the cord will becompletely impregnated, the apparatus being provided with means forflexing and/or squeezing the cord to facilitate this impregnation.

Another object is to provide such an apparatus with its parts soarranged that the latex will be prevented from getting into the workingparts thereof and interfering with the operation,

Another object is to provide apparatus for winding up the impregnatedand coated cord on to suitable holders, and for regulating the tensionof the cord while being so wound; also for winding the cord in levellayers on the holder; and also for disconnecting the power from themachine in the event of the cord becoming tangled or failing to wind.

Another object is to provide apparatus for regulating the level of thelatex relative to the cord.

Another object is to provide means whereby the cord will be passedthrough the solution under as slight a tension as is convenient in orderto enhance the opening up of the internal fibers and strands tofacilitate the impregnation thereof.

In the drawings:

Figure 1 is a diagrammatic plan view, partly in section, of theapparatus of my invention,

showing the main elements involved in its operation;

Figure 2 is 'a diagrammatic side elevation, partly in section, of theapparatus shown in Figure 1;

Figure 3 is a side elevation, partly in section, of the lateximpregnating section of the apparatus;

Figure 4 is a section along the line 4-4 of Fi re 3; 5

brakes and level-winding devices;

Figure 10 is an electrical wiring diagram showing the electrical controlcircuit of the appa- 20 ratus;

Figure 11 is a righthand side elevation of the apparatus shown in Figure9;

Figure 12 is a diagrammatic vertical section along the line I2--l2 ofFigure 9;

Figure 13 is a lefthand side elevation of the apparatus shown in Figure9, showing the solenoidal brake mechanism for regulating the tension ofthe cords;

Figure 14 is an enlarged top-plan view of one 30 of the solenoidal brakeassemblies shown in Figure 13;

Figure 15 is an enlarged side elevation of the solenoidal brake assemblyshown in Figure 14;

Figure 16 is a top plan view of a modified 35 form of impregnatingapparatus;

Figure 17 is a horizontal sectional view along the line I1I1 of Figure19;

Figure 18 is a horizontal sectional view along the line l8-l8 of Figure19;

Figure 19 is a side elevation of the latex impregnating apparatus shownin Figure 16;

Figure 20 is an enlarged view of a portion 01' one of the cords prior toits being impregnated 45 and/or coated with latex;

Figure 21 is a view similar to Figure 20, but showing the cord after ithas been impregnated and coated with latex.

The apparatus briefly described (Figures 1 and 50 2) consists of a latextank through which the cords are fed in circuitous paths under veryslight tension, the cords being thereby flexed and their internal fibersthus opened up for more convenient impregnation: additional devices forsqueezing the cord, while in the latex tank, may be optionally providedto enhance the impregnating action. Beyond the latex tank the cords passunder latex drying spouts over guide pulleys and around floating-armpulleys connected with devices for controlling the tension thereof.Beyond the floating-arm pulleys, the cords pass through a level Windingdevice on to power-driven spools whose driving mechanism is equippedwith brakes regulated by the float-arm pulley mechanism. Theimpregnating apparatus is provided with means for raising and loweringthe latex tank in order to control the level of the latex relative tothe positions of the cords.

Latex-impregnating section of the apparatus Referring to the drawings indetail, Figures 1 and 2 show the latex-impregnating section of theapparatus in relation to the other sections thereof, as previouslydescribed above. The unimpregnated cords I, 2, 3 and 4 are distributedfrom spools 5, 6, I and 8 mounted upon a spool rack 9 provided for thatpurpose. Four' spools and four cords are being shown for purposes ofillustration only, it being understood that a greater or lesser numberof cords may be used in the apparatus.

The progress of the cord I will be traced through the apparatus, thecourses of the other cords being substantially similar.

Beyond the spools, the cords pass through the distributor plate I0mounted on the base II of the latex-impregnating section of theapparatus (Figures 1 and 2). The base carries an upper platform I2(Figure 3) supported by the posts I3. The base I I is supported on amain frame I4. The latter also supports the latex tank I5, which issuspended by cables I6 passing over the guide pulleys II on to Windlassrods I8 (Figures 2 and 3). The ends of the Windlass rods I8 carry wormgears I9 which mesh with worms mounted on the crank shaft 2|, one end ofwhich is provided with the hand crank 22. Thus by turning the hand crank22, the cable Windlass shafts I8 are caused to revolve, winding up orunwinding the cables I6, and raising or lowering the latex tank I5suspended thereby. In this manner the level of the latex fluid in thetank may be adjusted relative to the apparatus .above it.

Supported partly by the base II and partly by the platform I2 is aplurality of spindle shafts 23 having bearings 24 in the base II andbearings 25 in the upper platform I2. Each one of the spindles 23 isprovided at its lower end with a roller 26 having grooves 21 in theperiphery thereof, these grooves being adapted to guide and space thevarious cords in their passage therethrough. Each spindle 23 isadditionally provided with a pinion 28 by which it is driven (Figure 3).The pinions 28 intermesh successively with one another (Figure 6), oneof them being provided with a master spindle 29 (Figure 3), having apinion 30 mounted on its uppermost end above the platform I2. Meshingwith this pinion 38 is a gear 3| on a collar 32, the upper portion ofwhich is provided with a bevel gear 33. The collar 32 is secured to ashaft 34 having bearings 35 and 36 in the main base II and the platformI2 respectively. The lower end of the shaft 34 is provided with asqueeze roller 31, and to its mid-portion is secured a gear 38. The gear38 meshes with a similar gear 39 (Figure 6). The

ratus is provided with a plurality of spindles and i l grooved rollerssimilar to those already described, and hence designated by the samenumerals. These other sets of rollers are driven by similar gearing tothe first set, through similar intermeshing pinions 28, master spindle42, master pinion 43, gear 44 meshing therewith, and mounted on thecollar 45 having the bevel pinion 46 attached thereto. The collar 45 issecured to the vertical shaft 41 (Figure 3) having bearings 48 and 49 inthe main base II and the platform I2 respectively. The shaft 4! isprovided with a squeeze roller 50 and also with a gear 5| meshing with asimilar gear 52. The latter is secured to a vertical shaft 53 mounted ina similar manner to shaft 4|], and carrying on its lower end the squeezeroller 54 (Figures 1 and 6). The squeeze rollers 56 and 54 are similarin construction and operation to the squeeze rollers 31 and 4|, of whichthey are substantially duplicates. Each cord is progressively andalternately flexed in opposite directions as it passes through the latexand thereafter compressed while in the latex.

The bevel pinions 33 and 46 mesh respectively with bevel pinions 55 and56 respectively, these being secured to the horizontal shaft 51 havingbearing support in the pillow blocks 58 and 59 respectively (Figure 3).The pillow blocks 53 and 59 are mounted upon brackets 66 and 6|respectively, these being mounted upon the platform I2. Beyond thepillow block 59, a bevel gear 62 is secured to the end of the horizontalshaft 51 (Figures 3 and 5). The bevel gear 62 meshes with a bevel pinion63 fixed to the cross shaft 64 supported in the pillow blocks 65 and 66respectively. The latter are supported on brackets 61 and 68 which inturn are supported by the platform I2. The outer end of the cross shaft64 carries the drive pulley 69. The latter is provided with a groove IIIwhich is belted through suitable gearing to a source of power, such asan electrical motor II (Figure 10).

Likewise attached to the platform II and extending downward into thetank on each end of the two rows of rollers 26 are cord guide plates I2and I3 respectively (Figure 3). These cord guide plates are providedwith apertures I4 and I5 adapted to receive the cord and direct itonward into the groove 21, the apertures I4 and I5 being aligned withthe grooves 21 for this purpose. The cord guide plates I2 and I3 aresecured to the platform II by the bolts I6 and II respectively.Similarly, the aperture plate I0 is provided with apertures I8 arrangedso as to (Figures 1 and 2).

Later-drying avid tension-controlling section of the apparatus Theabove-entitled section of the apparatus is shown in its relationship tothe remainder of the apparatus in Figures 1 and 2, and in enlargeddetail in Figures 'Iand 8. This section of the apparatus is supported bya frame 90.

The latex-drying portion is secured to a cross bracket 9I mounted on theupper part of the frame 90. The cross bracket 9| supports the cordtroughs 92 (Figures 1 and 8), through which the cords I, 2, 3 and 4 passafter leaving the apertures 83 in the aperture plate 19. Above each cordtrough. 92 is arranged an air pipe 93,'

controlled by the valve 94, and leading to the air conduit 95 supportedon the bracket 96 which in turn is mounted upon the cross bracket 9|.The valves 94 are adjusted so that a steady flow of air is directed uponthe cords, as they pass along through the cord troughs 92 (Figures 1, 7and 8) The tension-controlling apparatus is likewise arranged on theframe 90. Beyond the cord troughs 92, the cords pass over guide pulleys01 mounted on the guide pulley shaft 98. A plurality of ,these guidepulleys is provided, one guide pulley for each cord being impregnated.Beyond the guide pulleys 91, each cord passes downward and around afloating pulley 99 to a second guide pulley I00 mounted on a secondguide pulley shaft IOI, passing through the top portion of the frame 90(Figures 1, 7 and 8). Beyond the guide pulleys I00, each cord passesthrough apertures I02 in a third aperture plate I03 likewise mounted ontop of the frame 90.

The floating pulleys 99 are supported on axles I04 which in turn arecarried by yokes I05 adjustably attached to the floating arms I06, as bythe set screws I01 engaging the socket I08 surrounding the end of thefloating shaft I06. The latter is mounted in an axle disk I09 throughwhich passes the spindle II3 (Figures .7 and 8).

Beyond the disk I09 a continuation shaft IIO may be supplied, andprovided with a movable counter-weight III with a set screw II2 engagingthe shaft IIO. By sliding the counterweight I II along the shaft I I0,it is obvious that the amount of force required to lift the floatingpulley 99 will be varied. For each cord being impregnated, there isprovided a separate floating pulley 99 and the devices associated withit, as describedabove.

Between the spindle H3 and the floating pulley 99, a connecting rod H4is attached, as by the yoke II5 pivotally engaging it by means of thepivot pin II6 (Figure 8). Each connecting rod II4 near its opposite endcarries an upper collar I I1 and a lower collar I I8. Between thesecollars the rod II4 passes through the switch lever II9. Eachconnectingrod H4 is guided in its reciprocation by the guide arm I24fixedly attached to the frame member I2I. The switch arm I I9 ispivotally mounted on the screw I20 secured to the frame member I2I whichin turn is attached to the frame .90. The opposite end of the lever H9is provided with a bracket I22 which carries the mercury switch I23. Thelatter is connected by suitable wiring to the remainder of theelectrical circuit.

Pivotally 'secured to the upper end of the frame arm I2I, which isspaced from the main frame 90 by the horizontal arm I28, is a lever I29.One end of the lever finds bearing support on the pivot pin I30, whereasthe opposite end is pivotally connected, as at I3I, to the connectingrod I32. The lower 'end of the latter Is pivotally connected, as at I33.to the lever- I34 which in turn is pivotally supported, as at I33, onthe upwardly extending frame arm I36. The lever I34 is provided with alatch arm I31 which has a cut-away portion I33 engaging one end of theswitch arm I38. The latter is pivotally mounted, as at I40, to thevertical frame memher I and carries the mercury switch I42. The latteris similar to themercury switch I23, and is likewise connected bysuitable wiring to the remainder of the electrical circuit hereinafterdescribed in detail. The lever I29 is provided with a stop arm I43 whichis pivotally attached thereto, as at I44, between the two ends I30 and I3| thereof. V

It will be understood that the apparatus is provided with one assemblyof the levers and switches I23 just described, for each cord beingimpregnated. The drawings (Figures 7 and 8) show four such assemblies,for controlling the tension of the four cords illustrated as an example.When the floating arm I06 moves upward or downward until it encountersthe stop arms I43 or I34, it will shift these, disengaging the latchmember I31 from the end of the switch arm I39. This causes the mercuryswitch I42 to be released, breaking the connection in the circuit towhich it is attached. These stop arms I43 and I34 thus constitute limitstops for the floating arm I06. In between these limits, however, eachmercury switch I23 controls the electrical apparatus as it is shifted upor down by the collars H1 or M8 on the connecting rod H4. The mercuryswitch I42 is connected to break the circuit in the latexing unit drivemotor H and the wind-up motor I45, described later. each of theelectrical switches I23 is connected to a solenoidal brake hereinafterdescribed.

Wind-up section of the apparatus Beyond the tension-regulating sectionof the apparatus is located the wind-up apparatus (Figures 1, 2, 9, 11and 13). The wind-up apparatus is mounted upon a frame I50, carryingspools I5I, I52, I53 and I54 (Figure 12). These spools serve to receivethe cord after it has been impregnated and coated with latex. Beforebeing wound on the spools I5I to I54 inclusive, the'cords pass through aguide arm I55 having guide apertures I56 therethrough. The guide arm I55is secured to a nut I51 which engages interlocking spiral grooves I58 ina shaft I59. The latter is supported in bearings I60 attached to theframe I50 and continues as the main drive shaft I63, which in turncarries the main drive pulley I6I secured thereto. The main drive pulleyI6I is grooved as at I62 to accommodate a V-belt whereby it is driven,through appropriate gearing, from the wind-up motor I45 (Figure 10).Consequently, when the pulley I62 is rotated, the nut I51 will move toand fro along the shaft I59, so that the apertures I56 guide the cordsin such a manner that these are wound in even layers upon the spools I5Ito I54.

The main drive shaft I63 likewise carries the grooved pulleys'l64, I65,I66 and I61, and is supported in the pillow block I68 at its outer end(Figures 9 and 13). The grooved pulleys I64, I 65, I66 and I61 aredrivingly connected to the pulleys I10, "I, I12'and I13 respectively bythe V-belts I14, I15, I16 and I11 respectively. The pulleys I10 to I13inclusive are loosely mounted on the shafts I18, I19, I and I8Irespectively,

supported in the bearing blocks or pillow blocks I82 mounted on theangle members I83 of the frame I50. The hub of each pulley I10, I'll,I12 or I13 is yieldably associated with springs I85, I86, I81 and I88 tocollars I89, I90, I9I and I92, which in turn are fixedly secured totheir respec tive shafts, as by set screws (not shown).

Each of the shafts I18, I19, I and I8I carries a brake drum, these brakedrums being respectively designated I 93, I94, I and I96 (Figures 9 and13). These brake drums are essentially alike, and each is engaged by abrake shoe I91 which is pivotally attached to the yoke I98 on the brakelever I99. The latter is pivoted at one end 200, and at the other end ispivotally joined at 20I to a plunger 202. Each of the plungers 202 issurrounded by a solenoid, these solenoids being respectively designated203, 204, 205 and 206. When the solenoids 203 to 206 inclusive areenergized, they draw their plungers 202 inward, causing their brakeshoes I91 to come in contact with their brake drums I93 to I96inclusive, retarding the shafts to which the brake drums are attached.

The machine is equipped with four pairs of rollers respectivelydesignated 201 to 2I4 inclusive, arranged in pairs. The forward rolls201, 209, 2 and 2I3 are arranged respectively on the shafts I18 to I8Iinclusive, these shafts carrying pulleys 2| 5 which drive pulleys 2I6operatively connected with the rearward rolls 208, 2 I0, 2I2 and 2I4,through the agency of the V-belts 2I1 (Figure 11). During the operationof the machine each of the cord spools I 5I to I54 inclusive rests upona pair of these rolls and is driven by them.

The mechanism is so arranged that the rolls 201 to 2 I4 inclusive aredriven at a slightly greater peripheral speed than the speed of thecord. Because of this difference in wind-up speed, the floating arm I06of each control unit gradually rises until it reaches the point where itcauses the mercury switch I23-to make contact, thereby energizing one ofthe solenoids, such as the solenoid 203. (Figure 10). The latter thusenergized operates its brake shoe I91 against the brake drum I93,causing the wind-up roll 201 to slow down or stop until the floating armI06 drops downward and causes the mercury switch 'to break the contactand de-energize the brake solenoid 203. When the brake is thus released,the wind-up roll 201 again begins to wind up the cord. and the foregoingoperation repeats itself.

The machine is additionally provided with a limit switch to stop itsoperation in case the cord tangles, especially in the spindles of thelatexing unit. This limit switch is the mercury switch I42, whosemechanical connections have-been previously described. If the cord stopswinding or tangles on either side of the floating pulley 99, thefloating arm I06 will either rise and push up the limit stop I43, orfall and push down the limit stop I34. In either case, the result willbe the shifting of the mercury switch I42, the latter then. making acontact and energizing the operating coil 2I9 of the;magnetic linestarter 2I9, throwing out the switch thereof and discon same result,without exceeding the scope of my invention.

Modified form of latexing section of the apparatus wearing life of themachine and reducing the frequency of repairs and replacements. Thepinions 228 of the modified form are driven from one another in exactlythe same manner as the pinions 28, the master spindle 229 having themaster pinion 230 which meshes with the gear 23I on the roll shaft 234.The cord passes through the modified machine in the path shown in Figure18, the operation being the same as in the form of machine previouslydescribed.

Operation The operation of the mechanical and electrical parts of themachine has been previously disclosed at the time these parts weredescribed. The cords pass from the spools 5, 6, 1 and 8 through theapertures 18 of the aperture plate I0 into the latex solution in thelatex tank I5 (Figures 1 and 2), thence through the apertures 14 of thecord guide plate 12. From the latter, the cords thread their way in andout between the rollers 26, having the grooves 21 to space the cords, ontheir way passing between the squeeze rolls 31 and M and also betweenthe squeeze rolls 50 and 54. While passing around the rollers 26, thecord is alternately flexed in opposite directions, since the directionof rotation is reversed between every roller by the arrangement of thegearing. This causes the cord to be flexed first one way and then theother, the twist thereof being thus opened up, permitting the latexsolution to penetrate through the innermost fibers of the cord. Thesqueezing and wringing action of the squeeze rolls further facilitatesthe thorough soaking of the cord with the latex and aids in thepenetration of the latexing solution. Since all of the rollers and thesqueeze rolls are driven, and are geared so that the peripheral speedsof all are the same, the cord is carried through the solution under verylittle tension. This reduction in the tension necessarily retards thetendency to twist the cord tighter, such as would result if the cordwere pulled through the solution under a greater tension, and causes thecord strands to open up in a more satisfactory way.

The cords emerge from the squeeze rolls 50 and 54 and then pass throughthe apertures 15 of the cord guide plate 13, thence upward through theapertures 83 of the aperture plate 19 above the latexing solution. Thelevel of the latter may be adjusted by rotating the hand crank 22,.andthereby moving the latexing tank up or down.

The cords then pass through the drying troughs 92 where their externalsurfaces are dried with air directed thereon from the drying pipes 93.The cords then pass over the guide pulleys 91, around the floatingpulleys 99, over the guide pulleys I08, through the apertures I02 of theaperture plate I03, thence through the apertures I55 in the guide 'armI55, and thence on to their respective spools Iii to in inclusive.

During this travel of the cords as described above, the tension of thecord is regulated by the floating arms I" and the mercury switches I23;and the machine is protected by the mercury limit switch I42 in case anyof the cords become tangled or for any reason are not wound on theirspools.

In utilizing my apparatus and process, it will be understood that it isnot necessary to confine the arrangement of the spindles 23 or 223 tothe straight-line or sta gered positions shown: on the contrary thespindles may be arranged in a circle, semi-circle, or any otherconvenient path. It will also be understood that the squeeze rolls 31,ll, 50 and 54 may be omitted if desired, without departing from thescope of my invention.

The tension under which the cords operate may be varied as desired. Thisis accomplished by shifting the position of. the counter-weight Ill oneach of the floating arms I08 (Figure 8).

The cord before latexing has the loose fuzzy construction shown inFigure 20. After p ure 21. It will be understood that the drying stepmay be omitted, if desired, without departing from the scope of myinvention.

It will be understood that I desire to comprehend within my, inventionsuch modifications as may be necessary to adapt it to varying conditionsand uses.

Having thus fully described my invention, what I claim as new and desireto secure by Letters Patent is:

1. The process of impregnating a cord having a plurality of strands witha liquid which consists in causing the cord to move longitudinallythrough a liquid bath under continuous uniform tension, causing the cordto be progressively and alternately flexed in opposite directions in theliquid to open the strands without stoppin the cord movement and withoutreducing the tension on the cord as a whole, and thereafter compressingthe cord in the liquid.

2. The process of impregnating a cord having a plurality of strands witha liquid which consists in causing the cord to move longitudinallythrough a liquid bath under continuous uniform tension, causing the cordto be progressively and alternately flexed in opposite directions in theliquid to open the strands without stopping the cord movement andwithout reducing the tension on the cord as a whole, and causingpressure to be applied to the liquid about the inner half pe-' ripheriesof the cord at its points of flexion.

3. In a process of impregnating a cord of textile material having aplurality of twisted strands to form the cord, immersing the cord in alatex solution, bending the cord in alternate directions in closesuccession while immersed, maintaining the cord under substantiallyuniform tension" while so immersed, and maintaining it at asubstantially uniform speed of movement continuously while immersed.

4. In a process of impregnating a cord of textile material having aplurality of twisted strands to form the cord, immersing the cord in alatex solution, bending the cord in alternate directions in closesuccession while immersed, maintaining the cord under substantiallyuniform tension while so immersed maintaining it at a substantiallyuniform speed of movement-continuously while immersed, and squeezing thecord while immersed.

5. In a process of impregnating acord of textile material having aplurality of twisted strands to form the cord, immersing the cord in alatex solution, bending the cord in alternate directions in closesuccession while immersed, maintaining the cord under substantiallyuniform tension while so immersed, maintainingit at a substantiallyuniform speed of movement continuously while immersed, and squeezing thecord while immersed between intervals of a series of reverse bends ofthe cord.

6. In a process of impregnating a cord of textile material, conveyingthe cord through a latex bath, and flexing the cord in oppositedirections in close succession to open the fibers of the cord toimpregnate the cord with latex first in one direction and then in theother for uniform impregnation while maintaining the speed; tension andlength substantially constant.

'7. In a process of impregnating a cord of textile material, conveyingthe cord through a latex bath, flexing the cord in opposite directionsin close succession to open the fibers of the cord to impregnate thecord with latex first in one direction and then in the other for uniformimpregnation while maintaining the speed, tension and lengthsubstantially constant, and squeezing the cord while immersed to pressthe latex into the fibers of the cord.

NORMAN J. RI'IZERT.

